Kenmore Washer Error Code F42: Motor Overheating... | appliancefaults.com

Technical Background:

The F42 error code on a Kenmore washer indicates that the motor control unit (MCU) has detected an over-temperature condition in the motor. The MCU monitors the motor temperature via a thermistor or other temperature sensor. If the temperature exceeds a pre-defined threshold, the MCU shuts down the motor and displays the error code to protect the motor from damage. The MCU receives 120V AC from the breaker panel, rectifies and filters it to create various DC voltages for internal logic and motor control. It controls the motor speed and direction using pulse-width modulation (PWM) signals to the motor.

Symptoms:

The homeowner reports the washer stops mid-cycle and displays error code F42. They may also notice the motor is hot to the touch. The wash drum may not be spinning, or spins intermittently. Clothes may be excessively wet at the end of the cycle.

Possible Causes:

Overloaded washer with excessive laundry.
Blocked drain pump or drain hose restricting water flow.
Defective motor control unit (MCU).
Faulty motor winding or short circuit in the motor.
Worn motor bearings causing increased friction.
Incorrect voltage supply to the washer.

Solution:

1

Unplug the washer from the power outlet to prevent electrical shock. Always Lock-Out-Tag-Out the breaker.
2

Check the washer's drain hose for kinks or obstructions. Clear any blockages.
3

Inspect the drain pump for debris or foreign objects. Clean the pump filter if accessible.
4

Verify the voltage at the wall outlet using a multimeter. It should read approximately 120V AC.
5

Access the motor and motor control unit (MCU). Refer to the service manual for location and disassembly instructions.
6

Using a multimeter, test the motor windings for continuity and shorts to ground. Consult the service manual for expected resistance values. Replace the motor if necessary.
7

Inspect the wiring harness and connectors between the motor and MCU for damage or loose connections. Repair or replace as needed. Consider replacing the MCU if the motor tests okay.

Safety Warning:

Always disconnect the power supply to the washer before performing any repairs. Lock-Out-Tag-Out the breaker panel to prevent accidental energization. Be aware of high voltage components within the washer. Wear appropriate safety gear, including gloves and eye protection.

Prevention:

• Avoid overloading the washer with excessive laundry.
• Regularly inspect and clean the drain pump filter.
• Ensure the drain hose is free from kinks and obstructions.
• Periodically check the motor for signs of wear or damage.

Expert Tip:

Many Kenmore washers have a service mode accessible by pressing a specific sequence of buttons. Refer to the service manual to access service mode. This mode allows you to run diagnostic tests on the motor and other components, view error history, and calibrate sensors. Specifically, the start button + power button sequence may work. Consult the service manual for your exact model number.

Frequently Asked Questions

•What are the typical resistance values for a Kenmore washer motor?

Typical resistance values for a Kenmore washer motor windings vary depending on the model and motor type. However, a general guideline is between 3 to 6 ohms for each winding. Consult the service manual for the specific resistance values for your model.

•How do I access the motor control unit (MCU) on this Kenmore washer?

The location of the MCU varies depending on the model. Typically, it is located behind the control panel or near the base of the washer. Refer to the service manual for specific disassembly instructions and diagrams.

•What type of grease should be used on the motor bearings if they are accessible for maintenance?

Use a high-temperature, water-resistant grease specifically designed for electric motor bearings. Lithium-based grease is generally a good choice. Avoid using petroleum-based greases, as they can damage the motor windings.

Kenmore Washer Error Code F42: Motor Overheating Troubleshooting Guide

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What are the typical resistance values for a Kenmore washer motor?

•How do I access the motor control unit (MCU) on this Kenmore washer?

•What type of grease should be used on the motor bearings if they are accessible for maintenance?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: